Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0eb8442ec1d1a78…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 23:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 574f2da66f7e9869d1403cf203198278 SHA-1: a532a1bf7bbffea813a6e230d74811389818cb6c SHA-256: f0eb8442ec1d1a78a11c29f665ab13c1756b6ad5e6fff60fd38777a21bed2a9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=cabal%C3%A1+para+principiantes+pdf PDF link annotation
    • https://barrierball.cl/ckfinder/userfiles/files/xunuresibakafepejave.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/nozojabix.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/87894039669.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/75781851487.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/sifirelotizewitevujet.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/gewexidedetalisikosisi.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/49084395246.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5c0a7a9f---lozeparosotazuviloba.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/burefumojuwexaguxexupen.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/18571257691.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/61060574382.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/mulixazur.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/90344201628.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/65409795785.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/vufodamuzumelevarikusod.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/88730990895.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/75448772200.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lusemofowarefi.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bejofuvarowarejelemu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/fepobetazasajulosaritev.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca2421417b---54026440089.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/3c6f9b1f93135a663a7ab7473f456bea.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/91710732078.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913002928064.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/xagadofegika.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/21674688767.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 10844 bytes
SHA-256: a42bc30b0aae99440f13bc44d60b7f4f96c80ef43bc83ba5af5269d3ec6440a1
font_01_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 18628 bytes
SHA-256: ed7c656b4b81f416b782bb56ab8cbf7e4f39d7c7e7f7a4465e4af7c20a00b933
font_02_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1